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Date: Wed, 9 May 2018 22:39:16 -0500
From: Josh Poimboeuf <jpoimboe@...hat.com>
To: x86@...nel.org
Cc: linux-kernel@...r.kernel.org, Randy Dunlap <rdunlap@...radead.org>,
Arnd Bergmann <arnd@...db.de>,
Peter Zijlstra <peterz@...radead.org>,
Ingo Molnar <mingo@...nel.org>,
Thomas Gleixner <tglx@...utronix.de>,
Greg KH <gregkh@...uxfoundation.org>,
David Laight <David.Laight@...LAB.COM>,
damian <damian.tometzki@...oud.com>
Subject: [PATCH 3/3] objtool: Support GCC 8 switch tables
Add some additional checks to the switch jump table logic. This fixes
the following warnings with GCC 8:
drivers/block/virtio_blk.o: warning: objtool: virtio_queue_rq()+0x0: stack state mismatch: cfa1=7+8 cfa2=7+72
net/ipv6/icmp.o: warning: objtool: icmpv6_rcv()+0x0: stack state mismatch: cfa1=7+8 cfa2=7+64
drivers/usb/core/quirks.o: warning: objtool: quirks_param_set()+0x0: stack state mismatch: cfa1=7+8 cfa2=7+48
drivers/mtd/nand/raw/nand_hynix.o: warning: objtool: hynix_nand_decode_id()+0x0: stack state mismatch: cfa1=7+8 cfa2=7+24
drivers/mtd/nand/raw/nand_samsung.o: warning: objtool: samsung_nand_decode_id()+0x0: stack state mismatch: cfa1=7+8 cfa2=7+32
drivers/gpu/drm/nouveau/nvkm/subdev/top/gk104.o: warning: objtool: gk104_top_oneinit()+0x0: stack state mismatch: cfa1=7+8 cfa2=7+64
Reported-by: Arnd Bergmann <arnd@...db.de>
Reported-by: kbuild test robot <lkp@...el.com>
Signed-off-by: Josh Poimboeuf <jpoimboe@...hat.com>
---
tools/objtool/check.c | 24 ++++++++++++++++++++++--
1 file changed, 22 insertions(+), 2 deletions(-)
diff --git a/tools/objtool/check.c b/tools/objtool/check.c
index 14daf6a27d9f..6b6885e1e431 100644
--- a/tools/objtool/check.c
+++ b/tools/objtool/check.c
@@ -810,17 +810,28 @@ static int add_switch_table(struct objtool_file *file, struct instruction *insn,
struct rela *rela = table;
struct instruction *alt_insn;
struct alternative *alt;
+ struct symbol *pfunc = insn->func->pfunc;
+ unsigned int prev_offset = 0;
list_for_each_entry_from(rela, &file->rodata->rela->rela_list, list) {
if (rela == next_table)
break;
+ /* Make sure the switch table entries are consecutive: */
+ if (prev_offset && rela->offset != prev_offset + sizeof(long))
+ break;
+
+ /* Detect function pointers from contiguous objects: */
+ if (rela->sym->sec == pfunc->sec &&
+ rela->addend == pfunc->offset)
+ break;
+
alt_insn = find_insn(file, rela->sym->sec, rela->addend);
if (!alt_insn)
break;
/* Make sure the jmp dest is in the function or subfunction: */
- if (alt_insn->func->pfunc != insn->func->pfunc)
+ if (alt_insn->func->pfunc != pfunc)
break;
alt = malloc(sizeof(*alt));
@@ -831,6 +842,13 @@ static int add_switch_table(struct objtool_file *file, struct instruction *insn,
alt->insn = alt_insn;
list_add_tail(&alt->list, &insn->alts);
+ prev_offset = rela->offset;
+ }
+
+ if (!prev_offset) {
+ WARN_FUNC("can't find switch jump table",
+ insn->sec, insn->offset);
+ return -1;
}
return 0;
@@ -887,7 +905,9 @@ static struct rela *find_switch_table(struct objtool_file *file,
struct instruction *orig_insn = insn;
text_rela = find_rela_by_dest_range(insn->sec, insn->offset, insn->len);
- if (text_rela && text_rela->sym == file->rodata->sym) {
+ if (text_rela && text_rela->sym == file->rodata->sym &&
+ !find_symbol_containing(file->rodata, text_rela->addend)) {
+
/* case 1 */
rodata_rela = find_rela_by_dest(file->rodata,
text_rela->addend);
--
2.17.0
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